Table 1.

Classification of the visual field abnormalities

I. Neurologic abnormalities: chiasmal, retrochiasmal, optic nerve chiasm
I.1. Vertical step	Limited visual field loss that respects the vertical meridian and that includes at least two abnormal points at or outside 15° along the vertical meridian.
I.2. Quadrant	Significant visual field loss throughout an entire quadrant that respects the vertical midline. Essentially all points must have a P < 5% value on the total deviation plot.
I.3. Partial hemianopia	A visual field defect that respects the vertical meridian and that is greater than one quadrant but less than a complete vertical hemifield.
I.4. Hemianopia	A visual field defect that respects the vertical meridian and that involves essentially all points in a vertical hemifield.
I.5. Three quadrant	Significant visual field loss throughout three quadrants; essentially all points must have a P < 5% value on the total deviation plot.
II. Optic nerve abnormalities
II.1. Nerve fiber bundle abnormalities
II.1.a. Temporal wedge	A small visual field defect that is temporal to the blind spot.
II.1.b. Enlarged blind spot	A visual field abnormality in the nerve fiber bundle region that involves at least two points and is contiguous with the blind spot.
II.1.c. Nasal step	Limited visual field loss adjacent to the nasal horizontal meridian with at least one abnormal point at or outside 15° on the meridian. Cannot include more than one significant point (on either plot) in the nerve fiber bundle region on the temporal side.
II.1.d. Paracentral	A relatively small visual field abnormality in the nerve fiber bundle region that is generally not contiguous with the blind spot or the nasal meridian. In particular, it does not involve points outside 15° that are adjacent to the nasal meridian.
II.1.e. Partial arcuate	Visual field loss in the nerve fiber bundle region that extends incompletely from the blind spot to the nasal meridian. The defect is generally contiguous with either the blind spot or the nasal meridian and must include at least one abnormal location in the temporal visual field.
II.1.f. Arcuate	Significant visual field loss in the nerve fiber bundle region, extending across contiguous abnormal points from the blind spot to at least one point outside 15° adjacent to the nasal meridian.
II.1.g. Altidudinal	Severe visual field loss throughout the entire superior or inferior hemifield that respects the horizontal midline, with most points in the hemifield having a P < 5% value on the total deviation plot and the entire horizontal midline demonstrating abnormality.
II.2. Diffuse abnormalities
II.2.a. Multiple foci	Visual field loss that includes two or more clusters of abnormal points (P < 5%) located in different areas of the visual field that do not correspond to a particular abnormality pattern. The loss must be present in both the total and pattern deviation plots.
II.2.b. Widespread	Diffuse visual field loss that includes all four quadrants. The Glaucoma Hemifield Test may show a general reduction of sensitivity or the MD must have a P level < 5%. The corrected pattern standard deviation must not have a P level < 5%. Most abnormal points on the total deviation plot are not abnormal on the pattern deviation plot.
II.3. Central abnormalities
II.3.a. Centrocecal	Visual field loss that is in the macular region and contiguous with the blind spot. The foveal threshold must have a P < 5% value. The loss must be symmetrical above and below the midline.
II.3.b. Central	Visual field loss that is predominantly in the macular region. The foveal threshold must have a P < 5% value, and the visual acuity must be impaired. Can be associated with a single hemifield and paired with another defect.
II.4. Severe abnormalities
II.4.a. Total loss of vision	Severe widespread visual field loss (MD ≤−20.00 dB) with visual acuity not totally impaired.
III. Artifactual abnormalities	Superior depression: Two or more abnormal points in the very superior region. Inferior depression: Two or more abnormal points in the very inferior region. Partial peripheral rim: Generally continuous visual field loss outside 15°, but not in all quadrants; must have some curvature. Peripheral rim: Generally continuous visual field loss outside 15° in all four quadrants, usually with no visual field loss inside 15° on either deviation plot. There must be visual field loss temporal to the blind spot.

Abbreviation: MD, mean deviation.